Setting the zellij tab title to the running process in zsh

Here’s how to do it:

function current_dir() {
    local current_dir=$PWD
    if [[ $current_dir == $HOME ]]; then
        current_dir="~"
    else
        current_dir=${current_dir##*/}
    fi
    
    echo $current_dir
}

function change_tab_title() {
    local title=$1
    command nohup zellij action rename-tab $title >/dev/null 2>&1
}

function set_tab_to_working_dir() {
    local result=$?
    local title=$(current_dir)
    # uncomment the following to show the exit code after a failed command
    # if [[ $result -gt 0 ]]; then
    #     title="$title [$result]" 
    # fi

    change_tab_title $title
}

function set_tab_to_command_line() {
    local cmdline=$1
    change_tab_title $cmdline
}

if [[ -n $ZELLIJ ]]; then
    add-zsh-hook precmd set_tab_to_working_dir
    add-zsh-hook preexec set_tab_to_command_line
fi

Not actually the running process, but the last command line. This does unfortunately add a couple of milliseconds of lag but it’s fairly imperceptible. If you can make this happen faster, please comment on the gist.